Question

How many moles does 80.0 grams of H2O represent?

Answer 1

Answer on Question#50205 - Chemistry, Other

Task: How many moles does 80.0 grams of H2O represent?

Solution:

1. Find the molecular mass (M) of H2O. It is the mass of 1 mole of H2O. Atomic mass ($a_m$) of each chemical element we can find at the Periodic table.

$$M[H_2O] = 2 \times a_m[H] + a_m[O] = 2 \times 1 + 16 + = 18$$

2. Count the amount of moles (v) in 80.0 grams of H2O:

$$v = 80.0 \div 18 = 4, (4) \text{ moles}$$

Answer: 4,(4) moles.

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